Once doubled, punch the excess air out of the dough and divide into 8 equal pieces. Roll each one into a ball and pinch the bottom together. Take a long piece of string and find the halfway point. Place the half way point on top of the ball and flip the whole thing over. Pull the two pieces of string together and cross them over to create a cross on the bottom of the ball. Flip it over again and do the same thing until the ball is divided into 8 equal pieces. Tie the string at the top and cut off any excess. See the pictures below for the process. Cover the 8 rolls with cling film and let rise again for 30 minutes. The dough will puff out around the string and make pumpkin shapes.